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Schematic of the AC-SAIS model. Black edges correspond to neighborhood 
of susceptible node 
, while red edges represent the neighborhood 
when node 
is in the alert state. Here, 
, 
, and 
are the infection rate, curing rate, and alerting rate, respectively. 
is the number of infected neighbors of 
in 
at time 
and 
is the number of infected neighbors of 
in 
at time 
.
